Space & Cosmos

Black hole research questions Kerr solution assumptions

Left: A concrete realization of the Meisner-Sharp mass of Eq. (18) and parameters 𝑀0=10, ℓ=1, 𝑣𝑖=−20, 𝑣𝑓=1000, 𝑠1=1, 𝑠2=1/40. The radius of the outgoing shell is initially set to 𝑅⁡(𝑣=30)=5. Right: As an illustrative example, the Meisner-sharp mass in the interior region of the output shell 𝑀+⁡(𝑣,𝑅⁡(𝑣)) 𝑚⁡(𝑣)=−𝛽⁢(1+𝜀⁢cos⁡(𝜔⁢𝑣 ) )/𝑣)/𝑣𝑝 is 𝛽=1, 𝜔=1, 𝑝=2, 𝜀=0 (green solid line) or 𝜀=1 (purple dashed line), combining oscillatory and power law behavior is.

Black holes continue to fascinate scientists. Black holes are purely gravitational objects, and although they are surprisingly simple, they hold mysteries that challenge our understanding of the laws of nature. Most observations to date have focused on its external features and surrounding environment, and its internal properties remain largely unknown.

The new study, conducted in collaboration with the University of Southern Denmark, Charles University in Prague, Avanzati School of Higher Education (SISSA) in Trieste, and Victoria University of Wellington in New Zealand, was published in Physical Review Letters. This is a common aspect of the innermost regions of various space-time models explaining black holes, and suggests that our understanding of these enigmatic objects may require further investigation. Suggests.

According to lead author Raúl Carballo-Rubio, a postdoctoral researcher at the CP3-Origins Research Center at the University of Southern Denmark, a key insight from this study is that “the largely unknown internal dynamics of black holes may be “It has the potential to fundamentally change the world.” You can understand these objects even from an external perspective. ”

The Kerr solution to the equations of general relativity is the most accurate representation of a rotating black hole observed in gravitational astrophysics. This work depicts a black hole as a space-time maelstrom, characterized by two horizons. One is the outer horizon, where gravity cannot escape, and the other is the inner horizon surrounding the ring singularity, the region where space-time as we know it ceases to exist. . This model is in good agreement with observations, as deviations from Einstein’s theory outside the black hole are regulated by new physical parameters that govern the size of the core and are expected to be very small.

However, recent research conducted by an international team has highlighted serious questions about the interiors of these objects. Although static inner horizons were known to be characterized by an infinite accumulation of energy, the study further demonstrated that they are dynamic black holes. Significant instabilities can occur over relatively short time scales. This instability is due to the accumulation of energy that increases exponentially over time, reaching a finite but very large value, which has a large impact on the overall shape of the black hole, and the black hole may change.

Although the final outcome of this dynamical process is not yet clear, and the speed and magnitude of deviations from Kerr spacetime are still being investigated, this study shows that black holes are stable in Kerr geometry, at least on long timescales. It suggests that you can’t.

Stefano Liberati, a professor at SISSA and one of the study’s authors, said: “This result shows that, contrary to previous assumptions, the Kerr solution does not allow the observed black “This suggests that it is not possible to accurately describe the hole.”

Understanding the role of this instability is therefore essential for refining theoretical models of black hole interiors and their relationship to the overall structure of these objects. In this sense, it could provide the missing link between theoretical models and potential observations in physics beyond general relativity. Ultimately, these results open new perspectives in the study of black holes and provide an opportunity to deepen our understanding of their internal properties and dynamic behavior.

Further information: Raúl Carballo-Rubio et al, Mass Inflation without Cauchy Horizons, Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.133.181402. For arXiv: DOI: 10.48550/arxiv.2402.14913

Provided by International Graduate School of Higher Education (SISSA)

Citation: Black hole research challenges Kerr solution assumptions (November 1, 2024) from https://phys.org/news/2024-11-black-hole-kerr-solution-assumptions.html November 2024 Retrieved in 1 day

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